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<h1>sepia.cpp</h1><a href="sepia_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">//==============================================</span>
<a name="l00002"></a>00002 <span class="comment">// copyright : (C) 2003-2005 by Will Stokes</span>
<a name="l00003"></a>00003 <span class="comment">//==============================================</span>
<a name="l00004"></a>00004 <span class="comment">// This program is free software; you can redistribute it</span>
<a name="l00005"></a>00005 <span class="comment">// and/or modify it under the terms of the GNU General</span>
<a name="l00006"></a>00006 <span class="comment">// Public License as published by the Free Software</span>
<a name="l00007"></a>00007 <span class="comment">// Foundation; either version 2 of the License, or</span>
<a name="l00008"></a>00008 <span class="comment">// (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment">//==============================================</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="comment">//Systemwide includes</span>
<a name="l00012"></a>00012 <span class="preprocessor">#include <qimage.h></span>
<a name="l00013"></a>00013 <span class="preprocessor">#include <qstring.h></span>
<a name="l00014"></a>00014 <span class="preprocessor">#include <qapplication.h></span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">//Projectwide includes</span>
<a name="l00017"></a>00017 <span class="preprocessor">#include "<a class="code" href="sepia_8h.html">sepia.h</a>"</span>
<a name="l00018"></a>00018 <span class="preprocessor">#include "<a class="code" href="manipulationOptions_8h.html">manipulationOptions.h</a>"</span>
<a name="l00019"></a>00019 <span class="preprocessor">#include "../../gui/statusWidget.h"</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="comment">//----------------------------------------------</span>
<a name="l00022"></a>00022 <span class="comment">// Inputs:</span>
<a name="l00023"></a>00023 <span class="comment">// -------</span>
<a name="l00024"></a>00024 <span class="comment">// QString filename - location of original image on disk</span>
<a name="l00025"></a>00025 <span class="comment">// StatusWidget* status - widget for making progress visible to user</span>
<a name="l00026"></a>00026 <span class="comment">//</span>
<a name="l00027"></a>00027 <span class="comment">// Outputs:</span>
<a name="l00028"></a>00028 <span class="comment">// --------</span>
<a name="l00029"></a>00029 <span class="comment">// QImage* returned - constructed image</span>
<a name="l00030"></a>00030 <span class="comment">//</span>
<a name="l00031"></a>00031 <span class="comment">// Description:</span>
<a name="l00032"></a>00032 <span class="comment">// ------------</span>
<a name="l00033"></a>00033 <span class="comment">// This method constructs a sepia version of</span>
<a name="l00034"></a>00034 <span class="comment">// the image by computing a sepia value for each pixel. </span>
<a name="l00035"></a>00035 <span class="comment">// The sepia effect is intended to mimick sepia coloring </span>
<a name="l00036"></a>00036 <span class="comment">// obtained during traditional film development.</span>
<a name="l00037"></a>00037 <span class="comment">//</span>
<a name="l00038"></a>00038 <span class="comment">// First, a sepia color is chosen with a nice yellowy-orange tone</span>
<a name="l00039"></a>00039 <span class="comment">// (r,g,b = 162,128,101). This color is next converted to HSL </span>
<a name="l00040"></a>00040 <span class="comment">// (hue, saturation, luminance) space and used during sepia coloring.</span>
<a name="l00041"></a>00041 <span class="comment">// </span>
<a name="l00042"></a>00042 <span class="comment">// For each pixel, we construct a modified sepia color where the original</span>
<a name="l00043"></a>00043 <span class="comment">// luminance (brightness) is replaced with that pixels luminance using</span>
<a name="l00044"></a>00044 <span class="comment">// a weighted sum of the color channels. (For more information on image</span>
<a name="l00045"></a>00045 <span class="comment">// luminance see the blackWhite effect). This modified sepia color is</span>
<a name="l00046"></a>00046 <span class="comment">// converted back to RGB color space and used for the pixel color</span>
<a name="l00047"></a>00047 <span class="comment">// in the modified image. This way image brightness is maintained</span>
<a name="l00048"></a>00048 <span class="comment">// while color information is replaced with the sepia color. The</span>
<a name="l00049"></a>00049 <span class="comment">// sepia color can be adjusted to produce a differnt overall color</span>
<a name="l00050"></a>00050 <span class="comment">// feeling by changing the original sepia color.</span>
<a name="l00051"></a>00051 <span class="comment">//----------------------------------------------</span>
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="comment">//==============================================</span>
<a name="l00054"></a><a class="code" href="sepia_8h.html#ad6c6af0e83fde873fc69818cae51e974">00054</a> QImage* <a class="code" href="sepia_8cpp.html#ad6c6af0e83fde873fc69818cae51e974">sepiaEffect</a>( QString filename, <a class="code" href="classManipulationOptions.html">ManipulationOptions</a>* options )
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056 <span class="comment">//load image</span>
<a name="l00057"></a>00057 QImage* <a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a> = <span class="keyword">new</span> QImage( filename );
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="comment">//convert to 32-bit depth if necessary</span>
<a name="l00060"></a>00060 <span class="keywordflow">if</span>( editedImage->depth() < 32 )
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 QImage* tmp = editedImage;
<a name="l00063"></a>00063 editedImage = <span class="keyword">new</span> QImage( tmp->convertDepth( 32, Qt::AutoColor ) );
<a name="l00064"></a>00064 <span class="keyword">delete</span> tmp; tmp=NULL;
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="comment">//determine if busy indicators will be used</span>
<a name="l00068"></a>00068 <span class="keywordtype">bool</span> useBusyIndicators = <span class="keyword">false</span>;
<a name="l00069"></a>00069 <a class="code" href="classStatusWidget.html">StatusWidget</a>* <a class="code" href="redEye__internal_8h.html#a65b682074aef9e63bb1dad48c3e9e9df">status</a> = NULL;
<a name="l00070"></a>00070 <span class="keywordflow">if</span>( options != NULL && options-><a class="code" href="classManipulationOptions.html#a9bc4d4123333012b705b599043406e68">getStatus</a>() != NULL )
<a name="l00071"></a>00071 {
<a name="l00072"></a>00072 useBusyIndicators = <span class="keyword">true</span>;
<a name="l00073"></a>00073 status = options-><a class="code" href="classManipulationOptions.html#a9bc4d4123333012b705b599043406e68">getStatus</a>();
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="comment">//setup progress bar</span>
<a name="l00077"></a>00077 <span class="keywordflow">if</span>(useBusyIndicators)
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079 QString statusMessage = qApp->translate( <span class="stringliteral">"sepiaEffect"</span>, <span class="stringliteral">"Applying Sepia Effect:"</span> );
<a name="l00080"></a>00080 status-><a class="code" href="classStatusWidget.html#a57d461014070b9d651c36bd157cab9c1" title="Initializes the progress bar.">showProgressBar</a>( statusMessage, 100 );
<a name="l00081"></a>00081 qApp->processEvents();
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">//update progress bar for every 1% of completion</span>
<a name="l00085"></a>00085 <span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code" href="redEye__internal_8h.html#a32598f506d413f48cda8e1c930dae6b3">updateIncrement</a> = (int) ( 0.01 * editedImage->width() * editedImage->height() );
<a name="l00086"></a>00086 <span class="keywordtype">int</span> <a class="code" href="redEye__internal_8h.html#acaa08422437cae250a76ca488cbe1567">newProgress</a> = 0;
<a name="l00087"></a>00087
<a name="l00088"></a>00088 <span class="comment">//compute the hsl/hsv coordinates of sepia color</span>
<a name="l00089"></a>00089 <span class="keywordtype">int</span> sepiaH, sepiaS, sepiaL;
<a name="l00090"></a>00090 QColor(162,128,101).getHsv( &sepiaH, &sepiaS, &sepiaL );
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="comment">//iterate over each selected scanline </span>
<a name="l00093"></a>00093 <span class="keywordtype">int</span> x, y, pixelLuminance;
<a name="l00094"></a>00094 QRgb* rgb;
<a name="l00095"></a>00095 QColor sepiaColor;
<a name="l00096"></a>00096 uchar* scanLine;
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="keywordflow">for</span>( y=0; y<editedImage->height(); y++)
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 <span class="comment">//iterate over each selected pixel in scanline</span>
<a name="l00101"></a>00101 scanLine = editedImage->scanLine(y);
<a name="l00102"></a>00102 <span class="keywordflow">for</span>( x=0; x<editedImage->width(); x++)
<a name="l00103"></a>00103 {
<a name="l00104"></a>00104 <span class="comment">//compute gray value based on the display luminance of color coordinates</span>
<a name="l00105"></a>00105 rgb = ((QRgb*)scanLine+x);
<a name="l00106"></a>00106 pixelLuminance = (int) (0.2125*qRed(*rgb) + 0.7154*qGreen(*rgb) + 0.0721*qBlue(*rgb));
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="comment">//compute and set sepia color</span>
<a name="l00109"></a>00109 sepiaColor.setHsv( sepiaH, sepiaS, pixelLuminance );
<a name="l00110"></a>00110 *rgb = sepiaColor.rgb();
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="comment">//update status bar if significant progress has been made since last update</span>
<a name="l00113"></a>00113 <span class="keywordflow">if</span>(useBusyIndicators)
<a name="l00114"></a>00114 {
<a name="l00115"></a>00115 newProgress++;
<a name="l00116"></a>00116 <span class="keywordflow">if</span>(newProgress >= updateIncrement)
<a name="l00117"></a>00117 {
<a name="l00118"></a>00118 newProgress = 0;
<a name="l00119"></a>00119 status-><a class="code" href="classStatusWidget.html#ade18735223ae40506c32c96b9c9c5476" title="Updates the progress bar by one step.">incrementProgress</a>();
<a name="l00120"></a>00120 qApp->processEvents();
<a name="l00121"></a>00121 }
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="comment">//return pointer to edited image</span>
<a name="l00128"></a>00128 <span class="keywordflow">return</span> editedImage;
<a name="l00129"></a>00129 }
<a name="l00130"></a>00130 <span class="comment">//==============================================</span>
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